15. has a 3.5mm male connector

A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.

ifrogz Frequency

JLab Audio JBuds J6M

80% have it

16. cable length

A long cable ensures more freedom of movement.

1.2m

Pioneer SE-A1000: 6m

1.2m

17. has an on-ear form

This device comfortably rests on top of your outer ears. As it doesn't block out everything from the outside world, it's preferred in places like office environments and recommended for outdoor activities.

ifrogz Frequency

JLab Audio JBuds J6M

22% have it

18. has an in-ear form

The in-ear device is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. It is inserted in the ear canal itself and blocks out a lot of environmental noise. It has stronger bass tones and is unlikely to fall out of the ear.